Rep 21 and level 18 Warden here, here are my gear stats. Some may disagree with parts(most likely where I prioritize defense first), but I say just build to what you think fits you best and what you think will work for you.
Helmet: Defense, exhaustion recovery
Chest: Defense, revenge defense
Arms: Defense, stamina cost reduction
Blade: Defense penetration, attack
Hilt: Attack, execution health regen
Guard: Attack, revenge gained
EXAMPLE: Prioritized stat, secondary stat
Honestly, dont buff defens it will be negated by pen to nearly 0. If i would take the build i'd say.
Helmet: Defense, exhaustion recovery
Chest: Defense, revenge defense
Arms: Stamina cost reduction, Stamina reg
Blade: Attack, defense penetration
Hilt: Attack, execution health regen
Guard: Attack, revenge gained
With the upcoming patch i might switch the balde to Defens penetration, Atack. As long as we need 3 gearparts to have def negated by 1, def is only viable against undergeared oponents and only good to keep it at 0+